What a crazy year 2012 was for both Myles Kennedy and Mark Tremonti of Alter Bridge. We had "ABIII", Myles Kennedy on Slash's "Apocalyptic Love" record and Mark Tremonti's "All I Was" to enjoy.

Alter Bridge has hit the ground running to kick off 2013; Myles Kennedy and Mark Tremonti announced today on their Facebook page that "Writing on 'AB4' has begun. Very productive sessions so far!"

"AB4" is expected sometime later this year.

Starting in February, Tremonti will do dates in Europe and the U.S. with his solo band, while Kennedy will hook up with Slash for shows that begin January 31, in Dubai, United Arab Emirates.